珍稀油料树种琴叶风吹楠种子萌发习性

从西双版纳地区采集野生琴叶风吹楠(Horsfieldia pandurifolia)的种子开展萌发习性研究。结果表明:成熟的新鲜种子沙床催芽萌发率在96%以上,幼苗移栽成活率高达100%;相同植株的种子土壤播种萌发率为80.00%～86.27%,而整个果实播种萌发率仅有9.09%～33.33%;模拟野生环境下浅覆土的种子萌发率为55%～95%,不覆土的种子萌发率为20%～65%;8个月苗龄土壤播种苗11个家系平均株高为24.70～47.43cm,变异系数为21.95%～41.26%,平均地径为7.16～11.08mm,变异系数为16.62%～35.12%,家系间变异大。     

多抗、优质、丰产、中熟早籼水稻新品种的选育

经数年抗性鉴定表明,杂交育成的中熟早籼新品种HA79317-4和湘早籼3号(HA79317-7)抗白叶枯病、稻瘟病、褐飞虱、白背飞虱、黑尾叶蝉,而且抗性稳定。1981—1987年品比、省区试、南方稻区区试及大面积生产实践结果表明,亩产400公斤左右,比当地同熟期主栽品种增产5.81—11.01％,于1985年评为全国优质米品种,获农牧渔业部奖状和金杯奖。这两个新品种适宜于长江中、下游流域和以南地区种植,至1987年省内外已推广面积达1000万亩以上。     

Tape-Arabidopsis Sandwich - a simpler Arabidopsis protoplast isolation method

Background  

Protoplasts isolated from leaves are useful materials in plant research. One application, the transient expression of recombinant genes using Arabidopsis mesophyll protoplasts (TEAMP), is currently commonly used for studies of subcellular protein localization, promoter activity, and in vivo protein-protein interactions. This method requires cutting leaves into very thin slivers to collect mesophyll cell protoplasts, a procedure that often causes cell damage, may yield only a few good protoplasts, and is time consuming. In addition, this protoplast isolation method normally requires a large number of leaves derived from plants grown specifically under low-light conditions, which may be a concern when material availability is limited such as with mutant plants, or in large scale experiments.     

姑婆山国家森林公园景观格局变化分析

根据姑婆山国家森林公园1999年和2009年森林调查资料,在ArcGIS和Fragstas 3.3的支持下对姑婆山国家森林公园景观格局动态变化进行研究。结果表明：研究期间,研究区主要景观类型没有变化,阔叶树、灌木林、杉木林3种主要景观类型面积占总面积的比例由80.44%提高到94.51%;景观基质均为阔叶林,占总面积比例由63.63%提高到75.82%;总斑块数量由301块下降到174块;平均形状指数呈下降趋势;多样指数由1.233下降到0.862;优势度指数则由0.846升高至1.217。总体表现为针叶林向针阔混交林,进而向阔叶林演替,景观趋向连续和稳定。     

Dietary phosphorus requirement of GIFT strain of Nile tilapia Oreochromis niloticus reared in freshwater

A study was conducted to estimate the optimum requirement of dietary available phosphorus for GIFT strain of Nile tilapia Oreochromis niloticus. Six purified diets were formulated to contain graded levels (0 (control diet), 2.9, 4.8, 7.6, 9.1 and 10.9 g kg^?1 diet) of available phosphorus. Each diet was fed to triplicate groups of 12 fish with initial average weight (46.03 ± 2.14) g for 8 weeks. The results showed that fish fed the three lowest phosphorus diets (0, 2.9 and 4.8 g kg^?1) had significantly lower weight gain rate, specific growth rate (SGR) and feed efficiency than those fed the other diets (P < 0.05). The survival rate of fish fed the control diet was significantly lower than that of the fish fed the other diets (P < 0.05). Whole body viscerosomatic index and crude lipid content decreased significantly with increasing dietary available phosphorus levels (P < 0.05), while the contents of crude ash, calcium, phosphorus in the whole body and vertebrae showed the opposite trend (P < 0.05). The blood chemistry analysis showed that dietary available phosphorus had significant effects on serum phosphorus concentration, enzyme activities of alkaline phosphatase and parathyroid hormone level. Quadratic curve analysis based on SGR indicated that the minimum dietary requirement of available phosphorus for maintaining optimal growth of tilapia was 8.6 g kg^?1.     

中职学校德育课课程改革初探

随着新一轮的中职学校德育课课程改革的深入开展和中职学生主体意识的增强,传统的德育课教学有许多方面需要进一步改进和完善.在中职学校德育课教学中实施高效良性的师生互动,能提高德育课的教学实效和学生的思想道德素质,为学生职业生涯发展奠定基础.     

广西玉米纹枯病菌培养性状及其致病力研究

从广西玉米主产区的8个县市秋玉米的纹枯病病株中分离出8个玉米纹枯病菌株,经生物性状的观察和菌丝融合群测定表明,它们都属于立枯丝核菌AGk-1-IA融合群;腐生定殖能力和致病力测定表明,菌株GX4、GX1的腐生定殖能力和致病力最强。     

河北省滨海平原区设施类型及灌水技术发展分析

为解决河北省蔬菜设施存在的诸如设施老化,结构不合理,参数不合理,灌水技术落后等问题,本研究对河北省滨海平原区的秦皇岛、山海关、昌黎至滦河口片的设施类型及灌水方式进行调研,了解了该分区设施类型及灌水方式的发展演变过程,并且提出适合该分区发展的理想设施类型为第四类日光温室,合理的前屋面采光角应该为33°5′~33°18′;后屋面角应为34°~35°。这一结果为研究区以后发展新日光温室及旧温室改造工作提供参数参考依据。     

中国真径茧蜂属Euagathis Szepligeti一新种及一新记录（膜翅目：茧蜂科：窄径茧蜂亚科）

窄径茧蜂亚科是鳞翅目幼虫的重要内寄生蜂．该亚科在中国大陆的区系尚无研究报道．本文记述真径茧样属ＥｕａｇａｔｈｉｓＳｚｅｐｌｉｇｅｔｉ的中国一新种—多刺真径茧蜂ＥｕａｇａｔｈｉｓｓｅｎｔｏｓｕｓＣｈｅｎ＆Ｙａｎｇ．及一中国分布新记录—透翅真径茧蜂Ｅｕａｇａｔｈｉｓｐｅｎｅｔｒａｎｓ（Ｓｍｉｔｈ），并提供了该属中国已知７种的分种检索表．新种的模式标本保存于福建农业大学植物保护系益虫研究室．     

贵州省六盘水市低碳农业发展探讨

从六盘水市低碳农业发展现状及低碳农业存在的问题着手,分析总结了六盘水市低碳农业发展对策后认为,在发展低碳经济方面,农业潜力巨大,低碳农业将是六盘水市实现低碳经济的根本保证和重要领域。